Randomized trial on acute toxicities of weekly vs three-weekly cisplatin-based chemoradiation in head and neck cancer.

Background: The current first-line treatment of locally advanced head and neck carcinoma (LAHNC) is concurrent chemoradiation with three-weekly cisplatin 100 mg/m . However, prescribing cisplatin at this dose increases the treatment toxicity, which may compromise the treatment results. An alternative schedule is weekly 40 mg/m cisplatin.

Aim: To compare the acute hematologic and renal toxicities of these two regimens.

Methods: This randomized clinical trial included 77 LAHNC patients who were allocated to a high dose (100 mg/m every 3 weeks) or low dose (40 mg/m weekly) cisplatin group concurrent with radiotherapy. Hematologic and renal indices were measured weekly during chemoradiation.

Results: The average age of patients was 55.3 years. Overall, 71.4% of patients were treated in a definitive setting. The incidence of severe hematologic events was not significantly different. However, the average estimated glomerular filtration rate (eGFR) was significantly greater in the three-weekly group (67.85 vs. 58.57% mL/min per 1.73 m ; P-value = .02). Cumulative cisplatin dose of ≥240 mg/m was significantly greater in the weekly group. Totally, treatment breaks occurred in 40.3% of patients due to treatment toxicity. Treatment interruption was primarily due to neutropenia in the three-weekly and renal dysfunction and thrombocytopenia in the weekly group.

Conclusions: Severe acute hematologic toxicities were comparable for three-weekly and weekly groups. The decrease in eGFR through treatment was more significant with weekly cisplatin. Further follow-up, however, is needed to confirm its impact on delayed renal function.